FISHERY BULLETIN; VOL. 83, NO. 1 



Figure 21. — Sicyonia brevirostris Stimpson,(5 18.1 mm cl, off Puerto Madero, Chiapas, Mexico. Lateral view. Scale 



= 5 mm. 



Figure 22. — Sicyonia brevirostris. Relationship be- 

 tween rostrum length and carapace length (regression 

 equation for specimens with carapace length less than 

 about 16 mm, V = 0.52372 + 0.33342;t:; regression equa- 

 tion for those larger, >> = 5.06145 + 0.01211x). 



T* 



c 



^ 4 



E 

 3 



16 24 32 



carapace length (mm) 



40 



four teeth: 1) epigastric tooth only slightly larger 

 than first rostral, situated from anterior to orbital 

 margin to as much as 0.1 cl posterior to it; and 2) 

 three large teeth usually placed posterior to level 

 of hepatic spine, anterior one (level with hepatic 

 spine in only three specimens examined) smallest, 

 situated between 0.20 and 0.28 (mean 0.25) cl from 



26 



orbital margin, middle tooth between 0.52 and 

 0.60 (mean 0.55) cl, and posterior one between 0.74 

 and 0.79 (mean 0.75) cl. Antennal spine moder- 

 ately long, projecting from strong buttress; hepa- 

 tic spine, longer than antennal, acutely pointed 

 and arising from moderately raised area between 

 0.20 and 0.25 (mean 0.23) cl from orbital margin. 



